TWI719345B - Antenna device - Google Patents

Abstract

By continuously integrating the entire bandwidth of 600MHz ~ 6GHz with one antenna device, it is possible to communicate with multiple types of communication devices that use different bandwidths without switching the antenna device. Below the antenna element (30) with the arcuate portion removed from the copper circular plate, a first insulating plate (40), a capacitive coupling portion (45a) of the tuning plate (45), and a radio wave absorber (50) are laminated in this order ), the ground portion (45b) of the tuning plate (45) which is folded back on the back of the radio wave absorber (50), and the tuning plate (55) where the metal plating film is formed on the surface.　　 The power feeding part (33) provided on a part of the circular arc peripheral edge part (32) of the antenna element (30) is fed from the central conductor (64) of the semi-rigid signal input member (61). The outer conductor (62) of the signal input member (61) is held by the elastically deformable conductive buffer (80a, 80b). The grounding plate (85) is connected to the outer conductor (62), and the grounding part (45b) and the tuning plating plate (55) are grounded.

Description

Antenna device

The present invention relates to an antenna device, and in particular, to communicate with other wireless devices in the frequency 600MHz~6GHz (commonly known as Sub6) used in the fifth-generation mobile communication, and can perform communication tests on other wireless devices. Antenna device.

In recent years, in mobile communication terminal devices such as mobile phones and smart phones, the frequency of radio wave transmission and reception has been expanded to a complex number of bandwidths. When conducting a communication test of such a mobile communication terminal device, it is necessary to prepare an antenna integrated in the specific measurement target for each bandwidth, and to switch the antenna for each bandwidth. "UWB (Ultra Wide Band) wireless system is known as a wireless system that uses an ultra-wide bandwidth of hundreds of MHz to several GHz as a radio station. Patent Document 1 describes a UWB antenna device, which includes: a flat-plate antenna portion that is roughly home-base type symmetrical in plan view, and a generally flat-plate rectangular shape that is arranged on the same substrate surface as the antenna portion and capacitively coupled to the antenna portion The ground (ground) part. [Advanced Technical Documents] [Patent Documents]

[Patent Document 1] JP 2008-199371 A

(The problem to be solved by the invention)

However, in the antenna device described in Patent Document 1, the bandwidth at which the VSWR (Voltage Standing Wave Ratio) becomes 2.0 or less is 3.1 GHz to 5 GHz. This antenna device is used in comparison with mobile phones and smart phones. The low-frequency 800MHz band, 1.5GHz band, etc. are not compatible with (integrated) problems. The present invention was developed in view of the above situation, and its purpose is to provide an antenna device that continuously integrates the entire bandwidth of 600MHz to 6GHz without switching the antenna device, which can be different from the used bandwidth. Antenna device that communicates with multiple types of communication devices. (Means to solve the problem)

In order to solve the above-mentioned problems, the present invention is characterized by: 　　antenna element, which is provided with a circular arc peripheral portion on at least a part of the peripheral part, and a power feeding part is provided on a part of the circular arc peripheral portion; The antenna element is insulated from the back side of the antenna element and is arranged to face each other. It is composed of a thin-plate-shaped conductor longer than the maximum diameter of the antenna element, and the area facing the back surface of the antenna element is set as a capacitor Coupling portion; "Radio wave absorber, which is arranged on the back side of the capacitive coupling portion of the tuning plate, and absorbs the radio waves radiated from the back side of the antenna element; 　　 The excessively long portion of the tuning plate is absorbed by the electromagnetic wave The side surface of the body is folded back to the back side of the radio wave absorber; 　　 tuning plating plate, which is arranged on the back side of the radio wave absorber, and a metal plating film is formed on the surface, and is similar to the one provided on the tuning plate. The grounding part of the long part is electrically connected; and the grounding member is electrically connected to the tuning electroplating plate. (Effects of the invention)

According to the present invention, it is possible to provide a single antenna device that continuously integrates the entire bandwidth of 600MHz to 6GHz without switching the antenna device, and can communicate with multiple types of communication devices using different bandwidths. The antenna device.

Hereinafter, the present invention will be explained in detail using the illustrated embodiment. However, the constituent elements, types, combinations, shapes, relative arrangements, etc., described in this embodiment are not intended to limit the scope of the invention to these, but are merely illustrative examples, as long as they are not specifically described.

[First Embodiment: Normal Model] 　　 FIGS. 1(a) and (b) are perspective views showing the appearance of the antenna device according to the first embodiment of the present invention. Fig. 2 is an exploded perspective view of the antenna device according to the first embodiment of the present invention. Fig. 3 is a perspective view showing a cross section of the antenna device cut along the signal input member. 4 is a perspective view showing a cross-section of the antenna device cut along a surface of the signal input member and a surface orthogonal to the surface.　　 The antenna device of this embodiment is characterized by the point where the insulator is inserted between the antenna element (antenna element) and the tuning plate. "In the following description, the side on which electromagnetic waves are radiated shall be the upper side (upper surface) or the front side (front surface), and the opposite side shall be the lower side (lower surface) or the back side (back surface). In addition, the description will be made assuming that the extending direction of the coaxial connector is the depth direction, and the direction orthogonal to the vertical direction and the depth direction is the width direction.

<Overview of the antenna element periphery> 　　 The antenna device 1 is provided with a case 10 that forms a hollow accommodating portion for accommodating various components. The case 10 is provided with: a roughly rectangular base 11 and a screw fixed to the base 11上盖12。 Upper cover 12. On one side panel 13 extending in the width direction of the upper cover 12, there is formed a coaxial member insertion hole 14 through which the signal input member 61 of the coaxial connector 60 is inserted, and a screw for fixing the coaxial connector 60 to the side. The insertion hole 15 of the panel 13.　　 Inside the housing 10 is an antenna element 30 having a semicircular plate shape (or bow shape). Below the antenna element 30 (on the back side), a first insulating plate 40 that insulates the antenna element 30 from other members, a tuning plate 45 as a short-circuit function, and a radio wave absorber 50 with a predetermined thickness t are laminated in this order , And tuning plate 55. In addition, the symbol 16 in the figure is an element guide for positioning the antenna element 30 in the housing 10.

<Antenna element> 　　 FIG. 5 is a perspective view of the antenna element mounted on the antenna device viewed from the back side.　　The antenna element 30 has a shape obtained by cutting the copper plate into two pieces from a circular copper plate with a string 31, excluding the small bow-shaped part of the two bow-shaped parts. The antenna element 30 is provided with a circular arc peripheral edge portion 32 in at least a part of the peripheral edge portion, and a power feeding portion 33 is provided in a part of the circular arc peripheral edge portion 32 here. The antenna element 30 is provided with a chord 31 connecting the end points of the circular arc peripheral edge portion 32 in another part of the peripheral edge portion.

The antenna element 30 is composed of a copper plate with a thickness of 0.8 mm, and its size is a radius r=35 mm, and a distance L1 from the center O to the chord 31=19 mm. Also, the length of the string 31 is approximately 59 mm. The central angle of the antenna element 30 (the central angle with respect to the circular arc peripheral portion 32) is greater than 180 degrees, about 245 degrees. By adopting a shape in which the arcuate part with a small central angle is removed from the circular copper plate, the VSWR characteristic can be greatly improved compared to the case where it is not removed. In addition, the electromagnetic waves radiated from the antenna element 30 are linearly polarized waves. "The antenna element 30 is at an appropriate position of the circular arc peripheral edge part 32, and in more detail, the center part of the circular arc peripheral edge part 32 has a power feeding part 33. As shown in FIG.　　 The size of the antenna element 30 is determined in consideration of the influence of the wavelength shortening caused by the dielectric constant of the radio wave absorber. If the radio wave absorber is made of polyurethane and the wavelength reduction factor 0.45 at the dielectric constant of 5 is reflected to λ/4 of 600 MHz, the shortened wavelength becomes 56 mm, so a circle with a diameter of 56 mm is set as the initial shape. As a result of an experiment in which the diameter of the circle is gradually enlarged, the diameter of the final circle is set to 70 mm. Moreover, in order to achieve integration around 600MHz, the bow shape part is removed and set to a shape where the straight edge (chord 31) is arranged. The size of the chord 31 is also the size after the shortening factor is reflected to about 600MHz λ/4, which is the most experimentally. Good characteristics, so about 59mm is adopted as the size of string 31.

<First insulating plate> 　　 Returning to FIG. 2, the first insulating plate 40 is made of an insulating synthetic resin such as an acrylic plate or a polyvinyl chloride plate. The first insulating plate 40 achieves the task of insulating the antenna element 30 and the radio wave absorber 50. The first insulating plate 40 is set such that the antenna element 30 and the tuning plate 45 are not electrically connected, and the size can be reliably maintained in an insulated state.

<Tuning Board> The "tuning board 45" functions as a short stub (short stub) that is capacitively coupled with the antenna element 30 according to the area facing the antenna element 30 to obtain impedance integration. The “tuning plate 45” is arranged to face each other while being insulated from the back side of the antenna element 30. The tuning plate 45 is composed of a thin plate-shaped conductor longer than the maximum diameter (maximum width) of the antenna element 30. Specifically, the tuning plate 45 has a rough strip shape, and is composed of a brass foil (brass foil, conductor) having a length of 115 mm in the longitudinal direction, a length of 25 mm in the width direction, and a thickness of 0.05 mm.

Among the tuning plate 45, the area facing the back surface of the antenna element 30 with the first insulating plate 40 interposed therebetween is a capacitive coupling portion 45a. In addition, the excessively long portions (45b, 45c) of the tuning plate 45 are folded back to the back side of the radio wave absorber 50 via the side surface of the radio wave absorber 50. A ground portion 45b electrically connected to the tuning plating plate 55 is provided in the excessively long portion that is folded back to the back side of the radio wave absorber 50. The ground portion 45b faces the back surface of the radio wave absorber 50. Between the capacitive coupling portion 45a and the ground portion 45b is a connection portion 45c that connects the two. The tuning plate 45 is bent into a J-shape, a U-shape, or bent into an angular U-shape, and the capacitive coupling portion 45a and the grounding portion 45b are respectively added on the front side and the back side of the radio wave absorber 50 Side, the radio wave absorber 50 is sandwiched in the thickness direction. With this configuration, the capacitive coupling portion 45a faces the back surface of the antenna element 30 via the first insulating plate 40, and the ground portion 45b provided at the other end of the length direction directly faces the surface of the tuning plating plate 55 .

The capacitive coupling part 45a is capacitively coupled with the antenna element 30. By making the area of the capacitive coupling portion 45a variable, the amount of capacitive coupling (tuning frequency or resonance frequency) between the tuning plate 45 and the antenna element 30 can be adjusted. "In this example, the capacitive coupling part 45a opposes the antenna element 30 over the entire width direction of the antenna element 30. As shown in FIG. In other words, the length in the longitudinal direction of the capacitive coupling portion 45 a is set to have a length substantially equal to or longer than the diameter of the antenna element 30. Therefore, the amount of capacitive coupling with the antenna element 30 is adjusted by the length of the short side direction of the capacitive coupling portion 45a (the length of the antenna device 1 in the depth direction). Here, when the coupling capacitance C1 formed between the antenna element 30 and the capacitive coupling portion 45a is adjusted separately, the inductance L1 formed according to the length of the capacitive coupling portion 45a is adjusted according to the well-known method using an impedance diagram (refer to FIG. 17) The integration strategy is to integrate the impedance of the 50Ω coaxial cable. For example, when the tuning frequency of the tuning plate 45 of this example is set to 1.3 GHz ~ 4.5 GHz, the length of the tuning plate 45 can be set to 115 mm in the longitudinal direction, and the length of the capacitive coupling part 45a can be set to 74 mm in the width direction. The length can be set to 25mm.

<Radio Wave Absorber> The "Radio Wave Absorber 50" is arranged on the back side of the capacitive coupling portion 45a of the tuning plate 45. The radio wave absorber 50 absorbs and attenuates radio waves radiated from the back side of the antenna element 30. The "radio wave absorber 50" is composed of foamed polyurethane in which carbon powder is dispersed and foamed. The radio wave absorber 50 has a size (area) covering the entire surface of the antenna element 30. The radio wave absorption characteristics of the radio wave absorber 50 are determined by its thickness t. The "radio wave absorber 50" only needs to have the ability to absorb radio waves in the entire frequency range corresponding to (integrable) of the antenna device 1. In this example, the radio wave absorber 50 can be ECOSORB AN74 manufactured by E&C Engineering Co., Ltd. (thickness 19mm, corresponding frequency 500MHz-9GHz).

By arranging the radio wave absorber 50 close to the antenna element 30, the radio wave absorber 50 can improve the reflection attenuation of the antenna device 1 (return loss (return loss) in the entire frequency range corresponding to (integrable)) of the antenna device 1. )) Characteristic tasks. In addition, since the radio wave absorber 50 has a certain degree of elasticity, it is compressed in the vertical direction of the antenna device 1 during installation to achieve the task of preventing the displacement of each member installed inside the housing 10. For example, by compressing the radio wave absorber 50 made of a foam having a thickness of about 20 mm by about 2 mm and installing it in the housing 10, it is possible to effectively prevent the displacement of other members installed in the housing 10.

<Tuning Plating Plate> The “tuning plating plate 55” is arranged on the back side of the radio wave absorber 50. A part of the upper surface of the tuning plate 55 is directly opposed to and in contact with the back surface of the radio wave absorber 50, and the other part is through the ground portion 45b of the tuning plate 45 and one end 85a in the longitudinal direction of the ground plate (ground member) 85 described later. Comes to face the back surface of the radio wave absorber 50. The tuning plate 55 is electrically connected by surface contact with the ground portion 45b of the tuning plate 45, and is electrically connected by surface contact with one end 85a of the ground plate 85 in the longitudinal direction.

The tuning plating plate 55 is formed with a metal plating film on the upper surface of a rectangular flat plate made of synthetic resin ABS resin. The metal plating film is a vacuum nickel vapor deposition plating film. The tuning plate 55 has a square shape with a side of 48 mm and a thickness of 1 mm. The tuning plate 55 is capacitively coupled with the antenna element 30 through the tuning plate 45, and mainly achieves the task of tuning the electromagnetic wave with a relatively low frequency bandwidth of 600MHz~1.5GHz. In addition, the tuning plating plate 55 is the result of experimentation. As long as more than 85% of its area is located directly under the antenna element 30, it is sufficient to achieve the above-mentioned task.　　 In addition, the tuning plating plate 55 has the task of realizing shielding to prevent the leakage of electric waves from the underside of the antenna device 1 to the outside.

<Summary of the surroundings of the power supply and grounding part> 　　 Describes the configuration of the surroundings of the signal input member that supplies power to the antenna element 30 and grounds each part of the antenna device 1. The antenna device 1 includes: a coaxial connector 60, which has a signal input member 61 whose central conductor 64 is electrically and mechanically fixed to the power feeding portion 33 of the antenna element 30; and a conductive buffer 80 (80a) that is elastically deformable , 80b), which has a cloth-like conductor at least on the outer periphery (outer surface), holding the outer conductor 62 of the signal input member 61; and a ground plate (grounding member) 85, which is connected to the outer conductor 62 of the signal input member 61 It is conductive, and a part is in contact with the ground portion 45b of the tuning plate 45. "Between the conductive buffer 80 and the antenna element 30 is a second insulating plate 81 that is inserted to insulate the two. In the second insulating plate 81, a slit 81a through which the central conductor 64 of the signal input member 61 passes from the side panel 13 side to the antenna element 30 side is formed in the vertical direction.

<Coaxial connector> The 　　 coaxial connector 60 is provided with: 　　 a signal input member 61 arranged at one end in the axial direction; 　　 is arranged at an axial middle portion, and a flange portion 67 that is conductive to the outer conductor 62 of the signal input member 61; And the connector part 71 (receptacle) of the transmission cable is detachably connected to the connector part 71 (coaxial container (receptacle)) of a transmission cable which is arrange|positioned at the other end part of an axial direction, and is electrically connected with each conductor of the signal input member 61.

The signal input member 61 is a semi-rigid coaxial member, and is inserted into the housing 10 through the coaxial member insertion hole 14. The outer conductor 62 of the signal input member 61 is composed of a seamless metal cylindrical body. In the hollow portion of the outer conductor 62, an insulator 63 such as fluororesin or polyimide is interposed to house the center conductor 64. In this example, the outer conductor 62 of the signal input member 61 is made of copper, and the center conductor 64 is a silver-plated copper-clad steel wire. The one end 64a in the axial direction of the center conductor 64 protrudes beyond the one end edge in the axial direction of the outer conductor 62 to the outside. In other words, the outer conductor 62 surrounds the central conductor 64 at the other end in the axial direction. The axial end portion 64 a of the central conductor 64 exposed to the outside is fixed to the power feeding portion 33 provided on the back surface of the antenna element 30 by soldering. The axial direction of the signal input member 61 extends in its depth direction based on the antenna device 1, and for the antenna element 30, it extends in the direction along the line of the circular arc peripheral portion 32, that is, the direction orthogonal to the chord 31.

At an appropriate position of the flange portion 67, the insertion hole 68 through which the shaft portion of the screw 77 is inserted is formed through. The flange portion 67 is fixed to the side panel 13 of the upper cover 12. On the inner surface of the side panel 13 is a connector plate 73 with a screw hole 74 formed with threads. In addition, a cable insertion portion 75 through which the signal input member 61 passes is formed at an appropriate position in the surface of the connector plate 73. The flange portion 67 and the connector plate 73 are made of a conductor such as iron. The coaxial connector 60 is in a state where the screw hole 74 of the connector plate 73 communicates with the insertion holes 15, 68 respectively formed in the side panel 13 and the flange portion 67, and the shaft portion of the screw 77 is inserted into each hole It is screwed to the screw hole 74 to be fixed to the side panel 13 of the upper cover 12. Since the connector plate 73 is electrically connected to the flange portion 67 via the conductive screw 77, the connector plate 73 is also electrically connected to the outer conductor 62 of the signal input member 61.

The connector portion 71 is an SMA (Sub Miniature Type A) type 50Ω connector, and is detachably connected to a transmission cable of a coaxial cable that transmits a high-frequency signal. By connecting the transmission cable to the connector portion 71, the inner conductor of the transmission cable and the central conductor 64 of the signal input member 61 are conducted, and the outer conductor of the transmission cable and the outer conductor 62 of the signal input member 61 are conducted.

<Grounding plate> The grounding plate 85 is a means for improving the VSWR (Voltage Standing Wave Ratio) characteristic in all the bandwidths (600 MHz to 6 GHz) corresponding to the antenna device 1 of the present embodiment.　　 The ground plate 85 has a roughly rectangular shape and is composed of a brass foil (brass foil) with a thickness of 0.05 mm. The width direction length of the ground plate 85 is 45 mm, which is the same as the width direction length of the conductive cushion 80. The length in the direction orthogonal to the width direction of the ground plate 85 (longitudinal direction length) is set so that the ground plate 85 can directly or indirectly ground the conductive buffer 80, the tuning plating plate 55, and the tuning plate 45.

The grounding plate 85 is a part (in this example, the middle part in the longitudinal direction), which is arranged between the inner surface of the side panel 13 and the connector plate 73, and is locked together with the side panel 13 and the flange portion 67 by screws 77 It is tightly attached to the connector plate 73, thereby being fixed in position in the housing 10. In addition, the ground plate 85 is in close contact with the connector plate 73, and thereby conduction with the outer conductor 62 of the signal input member 61 via the screw 77. The ground plate 85 is bent or deformed at an appropriate position in the longitudinal direction at the time of installation, and thereby becomes a posture deformed into a rough J-shape, L-shape, U-shape, or angular U-shape in the housing 10. In this example, one end 85a of the ground plate 85 in the longitudinal direction is in surface contact with the surface of the tuning plate 55 and the ground 45b of the tuning plate 45, and the other end 85b in the longitudinal direction is in contact with the conductive buffer. The object 80 is in surface contact to ground each member. "In addition, the other end 85b side in the longitudinal direction is set so as to exceed the second insulating plate 81 and has a length that does not protrude on the antenna element 30 side. That is, the ground plate 85 is not opposed to the upper surface of the antenna element 30.

<Conductive buffer> The "conductive buffer 80 (80a, 80b)" is held by sandwiching the outer conductor 62 of the signal input member 61 from the up and down direction, thereby conducting conduction with the outer conductor 62. In addition, the conductive cushion 80 is deformed by being pressed against the outer conductor 62 to realize the task of stabilizing the vertical position of the signal input member 61 inside the antenna device 1. "The conductive cushion 80 uses an elastically deformable foam as a core material, and is comprised by integrating a conductive cloth material in the outer peripheral part. The foam is preferably composed of an insulator such as foamed polyurethane, foamed neoprene, rubber sponge, etc. As the foam, conductive urethane foam or the like can also be used. The conductive cloth material is a net-like conductor formed by, for example, weaving or weaving metal fibers. For example, a metal wire or the like can be plated with copper to form a net. In addition, the conductive cloth material may be a non-woven fabric.

The conductive cushion 80 is arranged such that its length direction extends along a direction (approximately orthogonal) that intersects the axial direction of the signal input member 61, that is, the width direction of the antenna device 1. The tuning frequency of the conductive buffer 80 can be adjusted by the length of the conductive buffer 80 in the width direction of the antenna device 1. Here, when respectively adjusting the coupling capacitance C2 formed between the conductive buffer 80 and the ground plate 85 and the inductance L2 formed in accordance with the length of the conductive buffer 80, the impedance diagram (refer to FIG. 17) is well known. The integration strategy is to integrate the impedance of the 50Ω coaxial cable. For example, the conductive cushion 80a arranged on the upper side of the signal input member 61 can be set to a thickness (length in the vertical direction) 4mm×width (length in the depth direction) 10mm×45mm in length, and is arranged on the lower side of the signal input member 61 The conductive cushion 80b can be set to a thickness of 8mm × a width of 10mm × a length of 45mm. In this example, the tuning frequency of the conductive buffer 80 is 4.5 GHz to 6 GHz.

<The flow of electricity> When the “antenna device 1” is in the receiving state, the radio waves coming from the outside are picked up by the antenna element 30 and induced to the connector portion 71 by the signal input member 61. "On the other hand, when the antenna device 1 is in the transmission state, the radio waves supplied to the connector portion 71 are supplied to the antenna element 30 through the signal input member 61, and the radio waves are radiated to the space.

＜Effects＞ 　　As above, according to this embodiment, the wavelength of the frequency (600MHz~6GHz) corresponding to the antenna device 1 (600MHz~6GHz)/4 (125mm~12.5mm) is adopted with the wavelength shortened. A sufficiently large antenna element 30 is equipped with a member for improving the return loss characteristic according to each bandwidth. Specifically, the tuning plate 55 mainly improves the return loss characteristics of the 600MHz~1.5GHz frequency band, the tuning plate 45 mainly improves the return loss characteristics of the 1.3GHz~4.5GHz frequency band, and the conductive buffer 80 mainly improves the return loss characteristics of 4.5GHz. ~6GHz bandwidth return loss characteristics. In addition, the radio wave absorber 50 improves the return loss characteristics in a bandwidth of 500 MHz to 9 GHz.　　 By installing components that improve the return loss characteristics for each bandwidth in this way, it is possible to perform radio wave measurement in a wide range of bandwidths in one antenna device. In addition, by seeking the integration of the utilization of the dielectric constant, the wavelength will be shortened, and the antenna device can be miniaturized.

[Second Embodiment: NFC Model] 　　 FIGS. 6(a) and (b) are perspective views showing the appearance of an antenna device according to a second embodiment of the present invention. Fig. 7 is an exploded perspective view of an antenna device according to a second embodiment of the present invention.　　 The antenna device of this embodiment is characterized by having an NFC substrate for wireless communication based on NFC (Near Field Communication). Hereinafter, regarding the same configuration as the first embodiment, the same reference numerals are attached, and the description thereof will be omitted.

The antenna device 2 includes an NFC substrate 90 arranged above (on the front side) of the antenna element 30. The NFC substrate 90 is sandwiched between the element guide 16 and the upper panel 17 of the upper cover 12, thereby being contained in the housing 10 in a non-contact state with the antenna element 30. The NFC board 90 is provided with a USB (Universal Serial Bus) terminal 91 at an appropriate position of the edge portion as a connection terminal for wired communication. The USB terminal 91 is exposed to the outside through a USB terminal hole 19 formed through any side panel 18 of the upper cover 12.

NFC is a short-range wireless communication standard that uses a frequency of 13.56MHz and a communication distance of about 10cm. That is, the NFC substrate 90 is a communication substrate for performing short-distance wireless communication with a bandwidth different from the bandwidth radiated by the antenna element 30. The NFC substrate 90 is interposed between an information processing device such as a personal computer that can be connected to the USB terminal 91 and a wireless communication terminal device capable of communicating based on NFC, and realizes bidirectional communication between the information processing device and the wireless communication terminal device. . Here, the so-called wireless communication terminal device is, for example, a mobile phone, a smart phone, a Wi-Fi router, etc., and a device that transmits and receives information wirelessly becomes a device that uses each bandwidth of the antenna device 2 (in 600MHz~6GHz). Any of the frequency ranges included) is the test target of the communication test.

According to this embodiment, when the antenna device 2 is used to conduct a communication test of each bandwidth (any bandwidth in the range of 600MHz to 6GHz), the information processing device can obtain the communication result from the wireless communication terminal device according to NFC, And it can send a command to make the wireless communication terminal device from the information processing device generate the radio wave corresponding to the test content according to NFC.

[Explanation of graphs] <Antenna system and measurement system> 　　 Figure 8(a) is a block diagram showing an antenna system and a measurement system using an antenna device according to an embodiment of the present invention, and Figure 8(b) is a block diagram showing the measurement system used in this measurement A three-dimensional view of the calibration kit of the system. The antenna system 300 shown in FIG. 8(a) is provided with a pair of antenna devices. Each antenna device is set as a first antenna device 301 and a second antenna device 303, and the first antenna device 301 is opposed to each other. The second antenna device 303 arranged in the radiation direction of the antenna device 303 receives the radio waves radiated from the first antenna device 301.

The measurement system 310 is equipped with a network analyzer 315 and a monitor 313, a coaxial cable 307 is connected between the terminal P1 of the network analyzer 305 and the connector of the first antenna device 301, and the terminal P2 is connected to the second antenna device 301. A coaxial cable 309 is connected between the connectors of the 303.　　 Furthermore, a monitor cable 311 is connected between the monitor terminal 305m of the network analyzer 315 and the terminal 313m of the monitor 313. The network analyzer 315 is, for example, MS46322B manufactured by ANRITSU CORPORATION. The "antenna device" is arranged close to (closely attached to) the object to be measured, and is used to measure, for example, radio waves radiated from the object to be measured. The object to be measured is a mobile phone, a mobile terminal, etc. that generates electromagnetic waves. For example, it is a communication device (Sub6) that uses a bandwidth of 600MHz to 6GHz. The "measuring system 310" is suitable for measuring the coupling characteristics and the reflection attenuation characteristics between the first antenna device 301 and the second antenna device 303 included in the antenna system 300.

In this way, the antenna device 1 is arranged at a desired position or in close contact with the object to be measured, and receives radio waves radiated from the object to be measured. Furthermore, by arranging the object to be measured between the first antenna device 301 and the second antenna device 303, it is possible to measure the radio waves radiated from the object to be measured, or when the object to be measured receives a signal, the position of the object to be measured can be measured. The degree of impact caused.

In the measurement system 310 shown in FIG. 8(a), the calibration kit 320 shown in FIG. 8(b) is used for calibration.　　 The calibration kit 320 is equipped with four connectors: connector 320S (SHORT), connector 320o (OPEN), connector 320L (LOAD), and connector 320T (THRU). In addition, for the calibration kit 320, for example, TOSLKF50A-40 manufactured by ANRITSU CORPORATION is used.

<Calibration procedure of the measurement system> 　　 FIG. 9 is a flowchart showing the calibration procedure of the measurement system shown in FIG. 8. In detail, the calibration procedure of the measurement system 310 performed before the measurement of the reflection attenuation characteristic and the coupling characteristic of the antenna device 1 is shown.　　 In step S5, the measurement frequency (for example, 500 MHz to 6.2 GHz) is input to the network analyzer 315.　　 In step S10, the network analyzer 315 is set to the calibration CAL mode. "In step S15, the connector 320S of the calibration kit is connected to the front end of the coaxial cable 307 connected to the terminal P1 of the network analyzer 315, and the front end of the coaxial cable 307 is short-circuited (SHORT).　　 In step S20, the network analyzer 315 will perform calculations in the measuring device according to the user's operation. "In step S25, the connector 320o of the calibration kit is connected to the tip of the coaxial cable 307 connected to the terminal P1 of the network analyzer 315, and the tip of the coaxial cable 307 is opened (OPEN).　　 In step S30, the network analyzer 315 will perform calculations in the measuring device according to the user's operation. In step S35, the connector 320L of the calibration kit is connected to the front end of the coaxial cable 307 connected to the terminal P1 of the network analyzer 315, and a load (for example, 50Ω) is connected to the front end of the coaxial cable 307 (LOAD ).　　 In step S40, the network analyzer 315 will perform calculations in the measuring device according to the user's operation.

In step S45, the connector 320S of the calibration kit is connected to the front end of the coaxial cable 309 connected to the terminal P2 of the network analyzer 315, and the front end of the coaxial cable 309 is short-circuited (SHORT).　　 In step S50, the network analyzer 315 will perform calculations in the measuring device according to the user's operation. "In step S55, the connector 320o of the calibration kit is connected to the front end of the coaxial cable 309 connected to the terminal P2 of the network analyzer 305, and the front end of the coaxial cable 309 is opened (OPEN).　　 In step S60, the network analyzer 315 will perform calculations in the measuring device according to the user's operation. In step S65, the connector 320L of the calibration kit is connected to the front end of the coaxial cable 309 connected to the terminal P2 of the network analyzer 315 to form a load (for example, 50Ω) connected to the front end of the coaxial cable 309 (LOAD ).　　 In step S70, the network analyzer 315 will perform calculations in the measuring device according to the user's operation.

In step S75, the front ends of the coaxial cables 307 and 309 connected to the terminals P1 and P2 of the network analyzer 315 are connected to the connector 320T of the calibration kit, and the front ends of the coaxial cables 307 and 309 are placed in a passing state (THRU ).　　 In step S70, the network analyzer 315 will perform calculations in the measuring device according to the user's operation. "As a result, for the measurement system including the network analyzer 315 and the coaxial cables 307 and 309, the amplitude characteristics, reflection attenuation characteristics, phase characteristics, etc. can be corrected to a flat state in the set bandwidth.

<Reflection attenuation measurement program> 　　 FIG. 10 is a flowchart showing a reflection attenuation measurement program performed in the measurement system shown in FIG. 8. "In step S105, the connector of the first antenna device 301 is connected to the front end of the coaxial cable 307 connected to the terminal P1 of the network analyzer 315, and a measurable state is established.　　 In step S110, the network analyzer 315 performs calculations in the measuring device according to the user's operation, and displays the amount of reflection attenuation on the monitor 313. At this time, the power in the frequency sweep of the bandwidth output from the terminal P1 of the network analyzer 315 is reflected on the first antenna device 301, and the power returned from the first antenna device 301 is measured.

<Coupling loss characteristic measurement procedure> 　　 FIG. 11 is a flowchart showing a coupling loss characteristic measurement procedure performed in the measurement system shown in FIG. 8. "In step S155, the connector of the first antenna device 301 is connected to the front end of the coaxial cable 307 connected to the terminal P1 of the network analyzer 315 to form a measurable state.　　 In step S160, the network analyzer 315 performs in-device calculations, and displays the reflection attenuation of the first antenna device 301 on the monitor 313. "In step S165, the connector of the second antenna device 303 is connected to the front end of the coaxial cable 309 connected to the terminal P2 of the network analyzer 315, and a measurable state is established.　　 In step S170, the network analyzer 315 performs in-device calculations, and displays the reflection attenuation of the second antenna device 303 on the monitor 313. "In step S175, the first antenna device 301 and the second antenna device 303 are opposed to and approached (closely contacted).　　 In step S180, the network analyzer 315 performs calculations in the measuring device, and displays the coupling characteristics between the first antenna device 301 and the second antenna device 303 and the amount of reflection attenuation on the monitor 313.

<Standard characteristics of the regular model> 　　 FIG. 12 is a graph showing the standard characteristics of the reflection attenuation when the first antenna device 301 constructed in the first embodiment is a regular model.　　 In FIG. 12, (a) is an imit line showing -10.9dB, and (b) is a standard characteristic of the first antenna device 301.　　When the first antenna device 301 is a regular model, the reflection attenuation (return loss) is -10.9dB or more (in the case of VSWR, 1.8 or less) in the frequency bandwidth of 600MHz to 6GHz.

<Standard characteristics of the NFC model> 　　 FIG. 13 is a graph showing the standard characteristics of the reflection attenuation when the first antenna device 301 constructed in the second embodiment is the NFC model.　　 In FIG. 13, (a) is a limit line showing -10.9 dB, and (b) is a standard characteristic of the first antenna device 301.　　When the first antenna device 301 is an NFC model, the NFC substrate 90 is composed of a two-sided substrate having a predetermined area, and therefore affects the reflection attenuation (return loss) of the frequency bandwidth of 600MHz to 6GHz.　　 However, as shown in (b), the reflection attenuation (return loss) is -10.9dB or more (in the case of VSWR, 1.8 or less) in the frequency bandwidth of 600MHz to 6GHz.

<Effects by the Tuning Board> 　　 FIG. 14 is a graph showing comparative characteristics of the effects by the tuning board of the first antenna device 301. In FIG. 14, (a) shows the limit line of -10.9dB, (b) shows the standard characteristics of the first antenna device 301 (with the tuning plate 45), and (c) shows the characteristics without the tuning plate 45 , (D) is the characteristic when the tuning board 45 is not adjusted.　　The characteristic without the tuning board (c) and the characteristic (d) when the tuning board 45 is not adjusted are the limit line (a) exceeding -10.9dB in the vicinity of 500MHz to 1GHz.　　 On the other hand, the standard characteristic (with the tuning plate 45) that the tuning plate 45 provided in the first antenna device 301 is adjusted (b) is that a strong resonance of -35dB to -39dB is generated in the vicinity of 1.9GHz.

<Effects due to tuning plating> 　　 FIG. 15 is a graph showing comparative characteristics of the effects due to tuning plating of the first antenna device 301. In Figure 15, (a) shows the limit line of -10.9dB, (b) shows the standard characteristics of the first antenna device 301 (with tuning plate 55), (c) shows when there is no tuning plate 55 (D) is the characteristic when the inner surface of the substrate 11 is fully plated.　　The characteristic without tuning plate 55 (c) and the characteristic with tuning plate 55 unadjusted (d) are the limit line (a) close to -10.9dB in the vicinity of 500MHz~1.2GHz.　　 On the other hand, the standard characteristic of tuning plating plate 55 provided in the first antenna device 301 (with tuning plating plate 55) (b) is that strong resonance of -35dB to -39dB is generated in the vicinity of 1.9GHz.

<Effect due to conductive cushion> 　　 FIG. 16 is a graph showing comparative characteristics of the effect due to the conductive cushion of the first antenna device 301. Figure 16 (a) shows the limit line of -10.9dB, (b) shows the standard characteristics of the first antenna device 301 (with conductive buffer 80), and (c) shows that for the standard characteristics, there is no conductive buffer (D) shows the characteristics when the conductive buffer 80 is filled. "The characteristic (c) when there is no conductive buffer 80 is the limit line (a) exceeding -10.9dB in 500MHz~6GHz. The characteristic (d) when filled with conductive buffer 80 exceeds the limit line (a) of -10.9dB in the vicinity of 700MHz~1.2GHz. On the other hand, it produces -35dB~-40 dB in the vicinity of 3.8GHz~4GHz. Strong resonance. On the other hand, the standard characteristic of the conductive buffer 80 provided in the first antenna device 301 (with conductive buffer) adjusted (b) is that a strong resonance of -35dB~-39dB is generated around 1.9GHz~2GHz . Especially (b) is effective in the high frequency range of 6 GHz.

<Impedance diagram> 　　 FIG. 17 is an impedance diagram used to obtain impedance matching of the antenna device 1.　　Impedance diagram is a design used for impedance integration of RF (Radio Frequency) or microwave. The horizontal axis is the real part (resistance component) of impedance Z, and the vertical axis is the imaginary part (reactance component). The left end is equivalent to Z=0 (total transmission), and the right end is equivalent to Z=∞ (total reflection). In addition, the angle shown around is the phase θ (ANG: angle) of the voltage reflection coefficient. The center Z0 corresponds to the state where the load and the transmission path are integrated, and is usually 50Ω. However, in the impedance diagram, it is normalized based on the input impedance and expressed as 1.0.

[Summary of embodiments of the present invention and functions and effects] <First embodiment> The antenna device 1 of the present form is characterized by: 　　antenna element 30, which is provided with a circular arc peripheral edge portion 32 on at least a part of the peripheral edge portion, And a part of the circular arc peripheral portion is provided with a power supply portion 33; 　　 tuning plate 45, which is arranged oppositely while being insulated from the back side of the antenna element, and is formed by a thin plate-like shape that is longer than the maximum diameter of the antenna element The area facing the back surface of the antenna element is the capacitive coupling part 45a; the radio wave absorber 50 is arranged on the back side of the capacitive coupling part of the tuning board and absorbs from the back side of the antenna element Radiated radio waves; 　　 the excessively long portion (45b, 45c) of the tuning plate, which is folded back to the back side of the radio wave absorber via the side part of the radio wave absorber; 　　 tuning plating plate 55, which is arranged on the radio wave absorber On the back side of the tuning plate, a metal plating film is formed on the surface, and is electrically connected to the grounding portion 45b provided on the overlong part of the tuning plate; and a grounding member (grounding plate 85), which is electrically connected to the tuning plating plate. According to this aspect, it is possible to provide a single antenna device that continuously integrates the entire bandwidth of 600MHz to 6GHz, without switching antenna devices, and can communicate with multiple types of communication devices that use different bandwidths. The antenna device. That is, the radio wave absorber is arranged as a member to improve the reflection attenuation characteristics of the frequency radiated from the antenna element 30 in the full bandwidth, and the tuning plate and the tuning plate are arranged as the member to improve the frequency characteristics in each bandwidth. With impedance integration in the entire bandwidth of 600MHz to 6GHz, the VSWR can be less than 1.8.

<Second and Third Embodiments> "The antenna device 1 of this embodiment" is characterized by adjusting the tuning frequency with the antenna element 30 by changing the area of the capacitive coupling portion 45a of the tuning plate 45.　　 Also, it is characterized by the tuning frequency of the tuning board from 1.3 GHz to 4.5 GHz.　　According to this aspect, by capacitively coupling the antenna element and the tuning plate, the reflection attenuation characteristics of a specific bandwidth, specifically the intermediate frequency 1.3GHz~4.5GHz, can be improved and integrated.

<Fourth and Fifth Embodiments> “In the antenna device 1 of this embodiment, the antenna element 30 and the tuning plate 55 are capacitively coupled via the tuning plate 45 as a feature.　　 Also, the tuning frequency of the tuning plate is 600MHz~1.5GHz.　　According to this aspect, by capacitively coupling the antenna element and the tuning plate, it is possible to improve and integrate the reflection attenuation characteristics of a specific bandwidth, specifically a relatively low frequency of 600 MHz to 1.5 GHz.

<Sixth Embodiment> 　　The antenna device 1 of this embodiment is characterized by having a signal input member 61 and elastically deformable conductive cushions 80a, 80b. 　　The signal input member 61 is provided with an axial end portion 64a electrically conductive The central conductor 64 connected to the power feeding section 33 and the outer conductor 62 surrounding the other end of the central conductor in the axial direction with an insulator 63 interposed therebetween; 　　 the elastically deformable conductive buffers 80a, 80b are electrically conductive at least on the outer periphery Body, holding the outer conductor.　　 Although the antenna element 30 is energized by the signal input member in this form, by clamping the signal input member with a conductive buffer, the frequency characteristics of a relatively high bandwidth can be improved.

<Seventh and Eighth Embodiments> 　　 In the antenna device 1 of the present form, the conductive cushion 80 is arranged so that the longitudinal direction will extend in a direction intersecting the axial direction of the signal input member 61. By adjusting the conductive cushion The length of the object is long to adjust the tuning frequency of the antenna element 30 as a feature.　　 Also, it is characterized by a conductive buffer with a tuning frequency of 4.5 GHz to 6 GHz.　　 According to this aspect, the reflection attenuation characteristics from 4.5GHz to 6GHz can be improved by the conductive buffer.

<Ninth Embodiment> "In the antenna device 1 of the present embodiment, the ground member (ground plate 85) is electrically connected to the outer conductor 62 of the signal input member 61 as a feature. "According to this aspect, the tuning plate 45 and the tuning plating plate 55 are grounded via the grounding member, which contributes to the improvement and integration of the reflection attenuation characteristics in the necessary bandwidth.

<Tenth Embodiment> “The antenna device 2 of this form is characterized by the fact that the NFC substrate 90 is arranged on the surface side of the antenna element 30. As shown in FIG. Here, the NFC board is a board that enables bidirectional communication between an information processing device such as a personal computer and a wireless communication terminal device. The information processing device such as a personal computer can be passed through a USB terminal or the like provided on the NFC board. The wireless communication terminal device can communicate according to the NFC communication standard. According to this aspect, when the antenna device is used to conduct a communication test of the wireless communication terminal device, the information processing device can obtain the communication result from the wireless communication terminal device according to NFC, and can send a command to make the information processing device to the wireless communication terminal The device generates radio waves corresponding to the test content based on NFC.

1, 2‧‧‧Antenna device 10‧‧‧Shell 11‧‧‧Base 12‧‧‧Top cover 13‧‧‧Side panel 14‧‧‧Coaxial component insertion hole 15‧‧‧Insulation hole 16‧‧‧Component Guide 17‧‧‧Upper panel 18‧‧‧Side panel 19‧‧‧USB terminal hole 30‧‧‧Antenna element 31‧‧‧String 32‧‧‧Circular edge part 33‧‧‧Power supply part 40‧‧‧ First insulating plate 45‧‧‧Tuning plate 45a‧‧‧Capacitive coupling part 45b‧‧‧Grounding part 45c‧‧‧Connecting part 50‧‧‧Radio wave absorber 55‧‧‧Tuning plate 60‧‧‧Coaxial connector 61‧‧‧Signal input member 62‧‧‧Outer conductor 63‧‧‧Insulator 64‧‧‧Center conductor 64a‧‧‧One end in the axial direction 67‧‧‧Flange 68‧‧‧Insulation hole 71‧‧‧ Connector part 73‧‧‧Connector plate 74‧‧‧Screw hole 75‧‧‧Cable insertion part 77‧‧‧Screw 80‧‧‧Conductive buffer 80a‧‧‧Conductive buffer 80b‧‧‧Conductive Sexual cushion 81‧‧‧Second insulating plate 81a‧‧‧Gap 85‧‧‧Ground plate 85a‧‧‧One end 85b‧‧‧The other end 90‧‧‧NFC substrate 91‧‧‧USB terminal 300‧‧ ‧Antenna system 301‧‧‧First antenna device 303‧‧‧Second antenna device 305‧‧‧Network analyzer 305m‧‧‧Monitor terminal 307‧‧‧Coaxial cable 309‧‧‧Coaxial cable 310‧ ‧‧Measurement system 311‧‧‧Monitor cable 313‧‧‧Monitor 313m‧‧‧Terminal 320‧‧‧Calibration kit 320L‧‧‧Connector 320S‧‧‧Connector 320T‧‧‧Connector 320o‧‧‧ Connector

1(a) and (b) are perspective views showing the appearance of the antenna device according to the first embodiment of the present invention.　　 FIG. 2 is an exploded perspective view of the antenna device according to the first embodiment of the present invention.　　 FIG. 3 is a perspective view showing a cross-section of the antenna device cut along the signal input member.　　 FIG. 4 is a perspective view showing a cross-section of the antenna device along a plane along the signal input member and a plane orthogonal to the plane.　　 FIG. 5 is a perspective view of the antenna element mounted on the antenna device viewed from the back side.　　 FIGS. 6(a) and (b) are perspective views showing the appearance of an antenna device according to a second embodiment of the present invention.　　 FIG. 7 is an exploded perspective view of the antenna device according to the second embodiment of the present invention.　　 FIG. 8(a) is a block diagram showing an antenna system and a measurement system using the antenna device according to an embodiment of the present invention, and (b) is a perspective view showing a calibration kit used for calibration of the measurement system.　　 FIG. 9 is a flowchart showing the calibration procedure of the measurement system shown in FIG. 8, and in detail shows the calibration procedure of the measurement system performed before the measurement of the reflection attenuation characteristics and coupling characteristics of the antenna device.　　 FIG. 10 is a flowchart showing a reflection attenuation measurement procedure performed in the measurement system shown in FIG. 8.　　 FIG. 11 is a flowchart showing a procedure for measuring coupling loss characteristics performed in the measurement system shown in FIG. 8.　　 FIG. 12 is a graph showing the standard characteristic of the reflection attenuation when the first antenna device constructed in the first embodiment is a normal model.　　 FIG. 13 is a graph showing the standard characteristic of the reflection attenuation when the first antenna device constructed in the second embodiment is the NFC model.　　 FIG. 14 is a graph showing comparative characteristics showing the effect of the tuning plate of the first antenna device.　　 Fig. 15 is a graph showing comparative characteristics showing the effect of the tuning plated plate of the first antenna device.　　 FIG. 16 is a graph showing comparative characteristics showing the effect of the conductive cushion of the first antenna device.　　 FIG. 17 is an impedance diagram used to obtain impedance matching of the antenna device.

1‧‧‧Antenna device

10‧‧‧Shell

11‧‧‧Base

12‧‧‧Top cover

13‧‧‧Side panel

14‧‧‧Coaxial component insertion hole

15‧‧‧Through hole

16‧‧‧Component guide

30‧‧‧antenna element

31‧‧‧String

32‧‧‧Circular edge

33‧‧‧Department of Electricity

40‧‧‧First insulation board

45‧‧‧Tuning board

45a‧‧‧Capacitive coupling part

45b‧‧‧Grounding part

45c‧‧‧Connecting part

50‧‧‧Radio wave absorber

55‧‧‧Tuning plate

60‧‧‧Coaxial connector

61‧‧‧Signal input component

62‧‧‧Outer Conductor

64‧‧‧Center conductor

67‧‧‧Flange

68‧‧‧Through hole

71‧‧‧Connector

73‧‧‧Connector Board

77‧‧‧Screw

80a‧‧‧Conductive buffer

80b‧‧‧Conductive buffer

81‧‧‧Second insulating board

81a‧‧‧Gap

85‧‧‧Grounding plate

85a‧‧‧One end

85b‧‧‧The other end

Claims (10)

An antenna device characterized by: 　　antenna element, which is provided with a circular arc peripheral portion on at least a part of the peripheral part, and a power feeding part is provided on a part of the circular arc peripheral portion; The back side of the element is arranged to face each other, and is composed of a thin-plate-shaped conductor longer than the maximum diameter of the antenna element, and the area facing the back of the antenna element is used as a capacitive coupling part; 　　 electric wave The absorber is arranged on the back side of the capacitive coupling portion of the tuning plate and absorbs the radio waves radiated from the back side of the antenna element; 　　 the excessively long portion of the tuning plate is passed through the side surface of the radio wave absorber To be folded back to the back side of the radio wave absorber; 　　 tuning plating plate, which is arranged on the back side of the radio wave absorber, has a metal plating film formed on the surface, and is connected to the ground on the excessively long portion of the tuning plate The part is electrically connected; and the grounding member is electrically connected with the aforementioned tuning electroplating plate. Such as the antenna device of the first item of the scope of patent application, wherein the tuning frequency of the antenna element is adjusted by making the area of the capacitive coupling portion of the tuning plate variable. For example, the antenna device of item 1 or 2 of the scope of patent application, wherein the tuning frequency of the aforementioned tuning board is 1.3GHz~4.5GHz. The antenna device described in any one of items 1 to 3 in the scope of the patent application, wherein the antenna element and the tuning plate are capacitively coupled via the tuning plate. The antenna device described in any one of items 1 to 4 of the scope of patent application, wherein the tuning frequency of the tuning plated plate is 600MHz ~ 1.5GHz. For example, the antenna device described in any one of items 1 to 5 of the scope of patent application includes: 　　 signal input member, which includes: a central conductor whose one end in the axial direction is electrically connected to the aforementioned power supply unit, and a spacer An insulator is used to surround the outer conductor at the other end of the central conductor in the axial direction; and an elastically deformable conductive buffer having a conductor at least on the outer periphery to sandwich the outer conductor. For example, in the antenna device of claim 6, wherein the conductive buffer is arranged such that the longitudinal direction extends in a direction intersecting the axial direction of the signal input member, and the longitudinal direction of the conductive buffer is adjusted Long to adjust the tuning frequency of the aforementioned antenna element. For example, the antenna device of item 6 or 7 of the scope of patent application, wherein the tuning frequency of the aforementioned conductive buffer is 4.5GHz~6GHz. The antenna device described in any one of items 6 to 8 in the scope of the patent application, wherein the ground member is electrically connected to the outer conductor of the signal input member. The antenna device described in any one of claims 1 to 9, wherein the NFC substrate is arranged on the surface side of the antenna element.

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